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Solution:
Use preg_replace with the pattern (?:\r?\n[ ]*)+, and replace with <br><br>\n:
$input = "SOME TEXT\r\n \r\n\r\n\r\n \r\n\r\nSOME TEXT\r\n\r\n\r\n \r\n\r\n\r\n \r\n\r\n\r\n \r\n\r\n\r\n\r\n\r\nSOME TEXT\r\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n \r\n\r\n\r\n \r\n\r\n\r\n \r\n\r\n\r\n\r\n\r\nSOME TEXT\r\n\r\n\r\n \r\n\r\n\r\n \r\n\r\n\r\n \r\n\r\n\r\n\r\n\r\nSOME TEXT\r\n\r\n\r\n\r\n \r\n\r\n\r\n \r\n\r\n\r\n \r\n\r\n\r\n\r\n\r\nSOME TEXT\r\n\r\n\r\n \r\n\r\n\r\n\r\n\r\n\r\n\r\n";
$output = preg_replace("/(?:\r?\n[ ]*)+/", "<br><br>\n", $input);
echo $output;
This prints:
SOME TEXT<br><br>
SOME TEXT<br><br>
SOME TEXT<br><br>
SOME TEXT<br><br>
SOME TEXT<br><br>
SOME TEXT<br><br>
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